Stable ferrule type plug valve

Abstract

The utility model discloses a stable ferrule type plug valve, relates to the technical field of plug valves, and solves the problems of insufficient limit of a valve rod and the like. A first gland and a second gland are arranged above the valve cover, two heightening fixing columns are arranged on the valve cover in a protruding mode, and the two sides of the first gland are fixedly connected with the heightening fixing columns through bolts respectively. The second gland is located below the first gland and is perpendicular to the first gland around the center of the valve rod. A limiting piece is further installed between the first gland and the second gland, the valve rod is fixedly sleeved with the limiting piece so as to be in linkage with the limiting piece, the limiting piece extends outwards in the radial direction to form two protruding lugs, and the protruding lugs abut against the heightening fixing columns to form limiting fit. The fixing stability of the valve rod is enhanced through the first gland and the second gland, and the valve rod is prevented from axial displacement or radial swing in the operation process. The limiting piece is in linkage with the valve rod, the rotation range of the valve rod is limited, precise control over the movement direction of the valve rod is further improved, and the operation precision and stability of the valve are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plug valves, in particular to a stable sleeve type plug valve. Background Art

[0002] Traditional plug valves are usually composed of a valve body, a plug, a valve stem, a sealing assembly and an operating mechanism. Its working principle is to drive the plug to rotate through the valve stem to open and close the flow channel. However, there are still many defects in the prior art: for example, conventional plug valves mostly use a single gland structure to fix the valve stem, and the valve stem is prone to axial displacement or radial swing during frequent operation, resulting in wear of the sealing surface and leakage of the medium. Especially under high-pressure conditions, the single gland structure is difficult to effectively suppress the vibration and deviation of the valve stem, and the sealing reliability is significantly reduced. Moreover, during the rotation of the valve stem, its rotation angle lacks precise limit, and excessive rotation can easily cause misalignment and wear between the plug and the sealing surface of the valve body. In addition, a single plane limit is mostly used between the ferrule and the valve body. The deviation of the valve stem will inevitably lead to the cheapness of the valve core, which is prone to relative displacement of the ferrule during opening and closing, resulting in seal failure or loose installation. Utility Model Content

[0003] The purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a stable sleeve type plug valve, which solves the problems of insufficient valve stem limiting and single limiting structure.

[0004] The technical solution of the utility model comprises a valve body, a valve core, a valve stem, a ferrule and a valve cover, the ferrule is installed in the valve body, the valve cover is fixedly installed above the valve body, the valve stem passes through the valve cover and is fixedly connected to the valve core, a first gland and a second gland are arranged above the valve cover, the first gland and the second gland are respectively sleeved on the valve stem; two heightened fixing columns are convexly provided on the valve cover, the heightened fixing columns are integrally connected with the valve cover, and the two sides of the first gland are respectively fixedly connected with the heightened fixing columns by bolts; the second gland is located below the first gland and is vertically arranged with the first gland around the center of the valve stem, and the second gland is fixedly connected to the valve cover by bolts; a limiting plate is also installed between the first gland and the second gland, the limiting plate is fixedly sleeved on the valve stem to be linked with the valve stem, the limiting plate has two lugs extending radially outward, and the lugs abut against the heightened fixing columns to form a limiting fit.

[0005] By adopting the above technical solution, by setting the first pressure cover and the second pressure cover, the fixing stability of the valve stem is effectively enhanced, and the axial displacement or radial swing of the valve stem during operation is prevented, which is particularly suitable for high-pressure working conditions and can significantly improve the sealing reliability of the valve; the limit plate is linked with the valve stem, and the two lugs thereon are abutted against the raised fixing column to form a limit fit, which not only limits the rotation range of the valve stem, avoids the problem of misalignment and wear of the valve core and the valve body sealing surface caused by excessive rotation, but also increases the precise control of the movement direction of the valve stem, further improving the operating accuracy and stability of the valve.

[0006] In a possible design, the top end of the valve stem has a flat tenon head, and the limiting plate is provided with an inner hole that matches the shape of the flat tenon head.

[0007] The above design ensures a stable connection between the limit plate and the valve stem, allowing the limit plate to rotate synchronously with the valve stem, while effectively preventing the valve stem from slipping during rotation, thereby improving the stability and reliability of the overall structure.

[0008] In a possible design, the first pressure cover is radially protruded with at least one fixing portion, a fixing hole is opened in the fixing portion, and a limiting hole is opened in the lug. The limiting hole and the corresponding fixing hole can be aligned and penetrated by a fixing piece to relatively fix the first pressure cover and the limiting plate.

[0009] The above design achieves a firm fixation between the first pressure cover and the limit plate, which is suitable for preventing the valve stem from rotating in a scenario where the valve core and the valve stem do not need to be replaced for a long time.

[0010] In a possible design, the ferrule has a flow hole and an axial opening, and a first annular ridge is integrally provided at the orifice of the flow hole, and the first annular ridge is arranged around the entire orifice of the flow hole; a cylindrical contact wall is formed on the inner wall of the valve body that contacts the ferrule, and a first annular groove that matches the first annular ridge is formed on the contact wall.

[0011] The above design provides an effective anti-loosening structure, enhances the tightness between the ferrule and the valve body, helps prevent the ferrule from relative displacement due to fluid impact in the flow channel hole, ensures the tightness of the ferrule close to the flow channel hole, and improves the sealing performance.

[0012] In a possible design, a second annular ridge is integrally provided on the outer periphery of the axial opening, and a second annular groove matching the second annular ridge is formed on the contact wall.

[0013] The above design further strengthens the connection strength between the ferrule and the valve body, reduces the risk of axial loosening of the ferrule due to the opening and closing displacement of the valve core, and enhances the stability of the system.

[0014] In a possible design, a vertical groove is provided on the outer wall of the ferrule, the vertical groove extends upward from the bottom of the ferrule, and a vertical edge adapted to the vertical groove is formed on the contact wall.

[0015] The above design not only increases the friction between the ferrule and the valve body to prevent the ferrule from rotating, but also provides additional positioning support to ensure the accuracy and stability of the ferrule installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the appearance structure of a specific embodiment of the utility model;

[0017] Figure 2 It is a partial structural exploded diagram of a specific embodiment of the utility model;

[0018] Figure 3 A cross-sectional view of a specific embodiment of the utility model Figure 1 ;

[0019] Figure 4 A cross-sectional view of a specific embodiment of the utility model Figure 2 ;

[0020] Figure 5 This is a schematic diagram of the structure of the ferrule of the utility model;

[0021] Figure 6 It is a cross-sectional view of the valve body of the utility model;

[0022] Among them, 1. valve body; 11. first ring groove; 12. second ring groove; 13. vertical ridge; 14. flange; 2. valve core; 3. valve stem; 31. flat tenon head; 4. ferrule; 41. flow channel hole; 42. axial opening; 43. first ring ridge; 44. second ring ridge; 45. vertical groove; 5. valve cover; 51. heightened fixing column; 61. first pressure cover; 611. fixing part; 612. fixing hole; 62. second pressure cover; 63. bolt; 7. limit plate; 71. lug; 72. inner hole; 73. limit hole; 8. bracket. DETAILED DESCRIPTION

[0023] like Figure 1-4A stable sleeve-type plug valve shown in the figure comprises a valve body 1, a valve core 2 (i.e., a plug), a valve stem 3, a sleeve 4, and a valve cover 5. The sleeve 4 is installed in the valve body 1, and the valve cover 5 is fixedly installed above the valve body 1. The valve stem 3 passes through the valve cover 5 and is fixedly connected to the valve core 2. A first gland 61 and a second gland 62 are arranged above the valve cover 5, and the valve stem 3 passes through the first gland 61 and the second gland 62 respectively. Two heightened fixing columns 51 are convexly arranged on the valve cover 5, and the heightened fixing columns 51 are integrally connected to the valve cover 5. Both sides of the first gland 61 are fixedly connected to the heightened fixing columns 51 by bolts 63 respectively. The second gland 62 is located below the first gland 61 and is arranged vertically with the first gland 61 around the center of the valve stem 3. The second gland 62 is also fixedly connected to the valve cover 5 by bolts 63. The first gland 61 and the second gland 62 are respectively sleeved on the valve stem 3 from different positions to form a double constraint on the valve stem 3. When the valve stem 3 moves frequently, both the axial thrust of the medium and the radial disturbance force caused by vibration, pressure fluctuation, etc. can be effectively suppressed, greatly reducing the displacement and swing of the valve stem 3. Compared with the traditional single gland structure, the stability of the valve stem 3 is greatly improved, thereby reducing the wear of the sealing surface caused by the abnormal movement of the valve stem 3, and improving the overall sealing reliability of the valve, which is especially suitable for harsh working conditions such as high pressure and frequent operation. Moreover, the second gland 62 is located below the first gland 61 and is arranged vertically. The two work together to limit the freedom of the valve stem 3 from multiple directions, ensuring that the valve stem 3 always remains in the working position, and ensuring the smooth and stable operation of the valve. In addition, the two raised fixing columns 51 protruding from the valve cover 5 are integrally formed with the valve cover 5 to ensure structural strength. The first pressure cover 61 is fixed to the elevated fixing column 51 on both sides by bolts 63. On the one hand, it provides a stable support point for the first pressure cover 61, so that it can better withstand the external force transmitted by the valve stem 3 and avoid loosening or displacement. On the other hand, this connection method makes the installation position of the first pressure cover 61 more precise, which helps to cooperate with the second pressure cover 62 to achieve precise limiting of the valve stem 3 and enhance the reliability of the limiting structure of the entire valve stem 3.

[0024] A limit plate 7 is also installed between the first gland 61 and the second gland 62. The limit plate 7 is fixedly sleeved on the valve stem 3 to be linked with the valve stem 3. The limit plate 7 extends radially outward to have two lugs 71, and the lugs 71 abut against the heightened fixing column 51 to form a limit fit. When the valve stem 3 rotates, the limit plate 7 rotates accordingly, and the contact between the lugs 71 and the heightened fixing column 51 limits the rotation range of the valve stem 3. The rotation range of 90 degrees effectively prevents the valve stem 3 from excessively rotating and causing misalignment and wear of the valve core 2 and the ferrule 4, ensuring that each rotation of the valve core 2 is within a safe angle range, extending the service life of the sealing surface, and reducing the risk of valve damage due to misoperation.

[0025] The top of the valve stem 3 has a flat tenon head 31, and the limiting plate 7 has an inner hole 72 that matches the shape of the flat tenon head 31. The radial sides of the flat tenon head 31 are notched planes, and the inner hole 72 also has a protruding plane corresponding to the notched plane. During the rotation of the valve stem 3, there will be no relative sliding or displacement deviation between the limiting plate 7 and the valve stem 3, ensuring the accuracy of the lug 71 in limiting the rotation angle of the valve stem 3.

[0026] The first gland 61 is provided with two fixing parts 611 protruding radially outward, each fixing part 611 is provided with a fixing hole 612, and a limiting hole 73 is provided in the lug 71. The limiting hole 73 is aligned with the corresponding fixing hole 612, and a fixing piece can be passed through to fix the first gland 61 and the limiting piece 7 relatively. Under the requirements of valve assembly, debugging or specific working conditions, the first gland 61 and the limiting piece 7 can be artificially fixed relatively, and the initial limiting state of the valve stem 3 can be flexibly adjusted or the connection stability between the two can be strengthened under special working conditions to meet the diverse use requirements and improve the adaptability of the valve as a whole. For example, in the scenario where the valve needs to be opened for a long time, the valve core 2 needs to be kept in a certain position for a long time. Then, a fixing piece such as a padlock is passed through the limiting hole 73 and the corresponding fixing hole 612, and then the first gland 61 and the limiting piece 7 are locked to keep the valve stem 3 in position, so that the valve remains in an open state. In this way, it can prevent others from misoperating the valve, or the valve changes state due to abnormal external forces.

[0027] like Figure 3-6 As shown, the ferrule 4 has a flow channel hole 41 and axial openings 42 at the top and bottom ends. A first annular ridge 43 is integrally arranged at the opening of the flow channel hole 41, and the first annular ridge 43 is arranged around the opening of the entire flow channel hole 41; a roughly cylindrical contact wall is formed at the inner wall of the valve body 1 that contacts the ferrule 4, and a first annular groove 11 adapted to the first annular ridge 43 is formed on the contact wall. After the ferrule 4 is installed, a tight annular matching structure is formed. On the one hand, the positioning stability of the ferrule 4 at the flow channel hole 41 is enhanced, and the ferrule 4 is prevented from turning up or detaching from the flow channel hole 41 due to the action of the valve stem 3, the impact of the medium, etc., to ensure that the flow channel hole 41 is always accurately docked with the internal flow channel of the valve body 1, and to ensure that the medium flows smoothly; on the other hand, the cooperation of the annular groove and the ridge increases the sealing area, which helps to improve the overall sealing performance of the valve and reduce the risk of medium leakage.

[0028] For the axial openings 42 at the top and bottom of the ferrule 4, a second annular ridge 44 is integrally provided on the outer periphery of the corresponding opening, which cooperates with the second annular groove 12 on the contact wall of the valve body 1 to enhance the positioning accuracy of the ferrule 4 in the axial direction. During the frequent opening and closing of the valve, the ferrule 4 is effectively prevented from loosening or deflecting in the axial direction, ensuring a continuous and stable sealing effect between the ferrule 4 and the valve body 1, maintaining a good working state of the valve, and avoiding sealing failure and installation looseness caused by displacement of the ferrule 4.

[0029] A vertical groove 45 is provided on the outer wall of the ferrule 4, and the vertical groove 45 extends upward from the bottom of the ferrule 4 to about the middle position, and a vertical ridge 13 adapted to the vertical groove 45 is formed on the contact wall. The vertical ridge 13 is embedded in the vertical groove 45, which limits the circumferential rotational freedom of the ferrule 4. Even in a complex force environment, such as vibration, torque generated by fluid impact, etc., the ferrule 4 can be firmly maintained in the correct position.

[0030] A bracket 8 is installed on the valve body 1, and the support position of the bracket 8 is located at the flanges 14 on both sides of the valve body 1, and is fixedly connected to the corresponding flanges 14. The bracket 8 is used to support the actuator, so that the actuator is firmly installed on the valve body 1, the relative position between the actuator and the valve body 1 is ensured to be accurate and fixed, the burden on the valve cover 5 is reduced, and the opening and closing effects are reduced.

Claims

1. A stable sleeve-type plug valve, comprising a valve body (1), a valve core (2), a valve stem (3), a sleeve (4) and a valve cover (5), wherein the sleeve (4) is installed in the valve body (1), the valve cover (5) is fixedly installed above the valve body (1), the valve stem (3) passes through the valve cover (5) and is fixedly connected to the valve core (2), and is characterized in that: A first gland (61) and a second gland (62) are arranged above the valve cover (5), and the first gland (61) and the second gland (62) are respectively sleeved on the valve stem (3); two heightened fixing columns (51) are protruding from the valve cover (5), and the heightened fixing columns (51) are integrally connected to the valve cover (5), and both sides of the first gland (61) are respectively fixedly connected to the heightened fixing columns (51) by bolts (63); the second gland (62) is located below the first gland (61) and is arranged vertically with the first gland (61) around the center of the valve stem (3), and the second gland (62) is fixedly connected to the valve cover (5) by bolts (63); A limit plate (7) is also installed between the first gland (61) and the second gland (62); the limit plate (7) is fixedly sleeved on the valve stem (3) to be linked with the valve stem (3); the limit plate (7) has two lugs (71) extending radially outwards; the lugs (71) abut against the heightened fixing column (51) to form a limit fit.

2. The stable sleeve type plug valve according to claim 1, characterized in that: The top end of the valve stem (3) is provided with a flat tenon head (31), and the limiting plate (7) is provided with an inner hole (72) whose shape matches that of the flat tenon head (31).

3. The stable sleeve type plug valve according to claim 1, characterized in that: The first gland (61) is provided with at least one fixing portion (611) protruding radially outward, a fixing hole (612) is provided in the fixing portion (611), a limiting hole (73) is provided in the lug (71), and the limiting hole (73) and the corresponding fixing hole (612) are relatively aligned and can be penetrated by a fixing member so that the first gland (61) and the limiting plate (7) are relatively fixed.

4. The stable sleeve type plug valve according to claim 1 or 3, characterized in that: The ferrule (4) has a flow channel hole (41) and an axial opening (42), and a first annular ridge (43) is integrally provided at the opening of the flow channel hole (41), and the first annular ridge (43) is arranged around the entire opening of the flow channel hole (41); a cylindrical contact wall is formed at the inner wall of the valve body (1) in contact with the ferrule (4), and a first annular groove (11) adapted to the first annular ridge (43) is formed on the contact wall.

5. The stable sleeve type plug valve according to claim 4, characterized in that: A second annular ridge (44) is integrally provided on the outer periphery of the axial opening (42), and a second annular groove (12) adapted to the second annular ridge (44) is formed on the contact wall.

6. The stable sleeve type plug valve according to claim 4, characterized in that: A vertical groove (45) is formed on the outer wall of the ferrule (4), the vertical groove (45) extending upward from the bottom of the ferrule (4), and a vertical edge (13) adapted to the vertical groove (45) is formed on the contact wall.

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